Desktop: Enable GPU nodes (#3364)

* desktop simple nix ci

* make workflow manual

* fixup

* fix nix shell

* nix fmt

* fix shell

Author: timon-schelling

.github/workflows/build-nix-package.yml

@@ -0,0 +1,17 @@
+name: Build Nix Package
+
+on:
+  workflow_dispatch: {}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+
+      - name: Build Nix Package Dev
+        run: nix build .nix#graphite-dev --print-build-logs

.nix/cef.nix

@@ -0,0 +1,30 @@
+{ pkgs, inputs, ... }:
+
+let
+  libcef = pkgs.libcef.overrideAttrs (
+    _: _: {
+      postInstall = ''
+        strip $out/lib/*
+      '';
+    }
+  );
+  cefPath = pkgs.runCommand "cef-path" { } ''
+    mkdir -p $out
+
+    ln -s ${libcef}/include $out/include
+    find ${libcef}/lib -type f -name "*" -exec ln -s {} $out/ \;
+    find ${libcef}/libexec -type f -name "*" -exec ln -s {} $out/ \;
+    cp -r ${libcef}/share/cef/* $out/
+
+    echo '${
+      builtins.toJSON {
+        type = "minimal";
+        name = builtins.baseNameOf libcef.src.url;
+        sha1 = "";
+      }
+    }' > $out/archive.json
+  '';
+in
+{
+  env.CEF_PATH = cefPath;
+}

.nix/deps/cef.nix

@@ -0,0 +1,5 @@
+{ pkgs, inputs, ... }:
+
+{
+  lib = inputs.crane.mkLib pkgs;
+}

.nix/deps/crane.nix

@@ -0,0 +1,58 @@
+{ pkgs, inputs, ... }:
+
+let
+  extensions = [
+    "rust-src"
+    "rust-analyzer"
+    "clippy"
+    "cargo"
+    "rustc-dev"
+    "llvm-tools"
+  ];
+  toolchain = pkgs.rust-bin.nightly."2025-06-23".default.override {
+    inherit extensions;
+  };
+  cargo = pkgs.writeShellScriptBin "cargo" ''
+    #!${pkgs.lib.getExe pkgs.bash}
+
+    filtered_args=()
+    for arg in "$@"; do
+      case "$arg" in
+        +nightly|+nightly-*) ;;
+        *) filtered_args+=("$arg") ;;
+      esac
+    done
+
+    exec ${toolchain}/bin/cargo ${"\${filtered_args[@]}"}
+  '';
+  rustc_codegen_spirv =
+    (pkgs.makeRustPlatform {
+      cargo = toolchain;
+      rustc = toolchain;
+    }).buildRustPackage
+      (finalAttrs: {
+        pname = "rustc_codegen_spirv";
+        version = "0-unstable-2025-08-04";
+        src = pkgs.fetchFromGitHub {
+          owner = "Firestar99";
+          repo = "rust-gpu-new";
+          rev = "c12f216121820580731440ee79ebc7403d6ea04f";
+          hash = "sha256-rG1cZvOV0vYb1dETOzzbJ0asYdE039UZImobXZfKIno=";
+        };
+        cargoHash = "sha256-AEigcEc5wiBd3zLqWN/2HSbkfOVFneAqNvg9HsouZf4=";
+        cargoBuildFlags = [
+          "-p"
+          "rustc_codegen_spirv"
+          "--features=use-compiled-tools"
+          "--no-default-features"
+        ];
+        doCheck = false;
+      });
+in
+{
+  toolchain = toolchain;
+  env = {
+    RUST_GPU_PATH_OVERRIDE = "${cargo}/bin:${toolchain}/bin";
+    RUSTC_CODEGEN_SPIRV_PATH = "${rustc_codegen_spirv}/lib/librustc_codegen_spirv.so";
+  };
+}

.nix/deps/rust-gpu.nix

@@ -0,0 +1,22 @@
+{
+  pkgs,
+  deps,
+  libs,
+  tools,
+  ...
+}:
+
+pkgs.mkShell (
+  {
+    packages = tools.all ++ libs.all;
+
+    LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath libs.all}:${deps.cef.env.CEF_PATH}";
+    XDG_DATA_DIRS = "${pkgs.gsettings-desktop-schemas}/share/gsettings-schemas/${pkgs.gsettings-desktop-schemas.name}:${pkgs.gtk3}/share/gsettings-schemas/${pkgs.gtk3.name}:$XDG_DATA_DIRS";
+
+    shellHook = ''
+      alias cargo='mold --run cargo'
+    '';
+  }
+  // deps.cef.env
+  // deps.rustGPU.env
+)